Support StringLength in hydrogen (similar to ArrayLength).

src/builtins.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1210 matching lines @@
   return HandleApiCallAsFunctionOrConstructor(true, args);
 }
 
 
 static void Generate_LoadIC_ArrayLength(MacroAssembler* masm) {
   LoadIC::GenerateArrayLength(masm);
 }
 
 
 static void Generate_LoadIC_StringLength(MacroAssembler* masm) {
-  LoadIC::GenerateStringLength(masm);
+  LoadIC::GenerateStringLength(masm, false);
 }
 
 
+static void Generate_LoadIC_StringWrapperLength(MacroAssembler* masm) {
+  LoadIC::GenerateStringLength(masm, true);
+}
+
+
 static void Generate_LoadIC_FunctionPrototype(MacroAssembler* masm) {
   LoadIC::GenerateFunctionPrototype(masm);
 }
 
 
 static void Generate_LoadIC_Initialize(MacroAssembler* masm) {
   LoadIC::GenerateInitialize(masm);
 }
 
 
@@ skipping 286 matching lines @@
       if (entry->contains(pc)) {
         return names_[i];
       }
     }
   }
   return NULL;
 }
 
 
 } }  // namespace v8::internal